Subaru Legace 98 2.5 misfire HELP!!!!

[lg2002ukuk]

Hi i have a '98 Legacy 2.5 Quad Cam' and its got a misfire When its starts up in the morning its ok for about 2-3 mile then its starts. It happens more when its at optimum tempritcher and/or when cruising around 30mph. If i go beyond 4000 rpm it's fine and gos like a bat outa hell but anything under and it juders & wants to die. When im at lights it starts dieing it pops & bangs the revs go really low then just befor it dies it revs up. As im driving the misfire will go away and come back. Can any one help pleas?

Edited by lg2002ukuk on Tuesday 8th March 19:27

[smileykylie]

Im thinking coil pack may be on way out?

[lg2002ukuk]

Hi i have changed that and its still the same.

[smileykylie]

I assume then that plugs/leads OK?

All your engine earths OK?

Does this happen when wet/rain or all the time?

Also, what else have you eliminated ?

Had any work in general done to the car recently ?

Is yours N-a or turbo btw?

Sorry for all the questions

[lg2002ukuk]

I have only recently got the car so im not to shore about the plugs and leads just yet only because i have just bought a diagnostic kit and just waiting for it to be deliverd. Thought i would try that first.

engine earths good.

this happen's all the time. It wil misfire for abit then go away then come back etc....

nothing more at the moment.

no but it has been modified with De-Cat, stainless steel straight through exhaust, full K&N induction kit and been lowerd.

non turbo

is ok.

[Vixpy1]

MAF sensor or Lambda.

Has it thrown a check light?

[lg2002ukuk]

i suspect MAF sensor or Lambda my self hence why i bought the diagnostic kit because check light keeps going on and of all the time so i thought insted of keep replacing part by part and costing an arm and a leg hopefully the diagnostic kit will tell me what it is.

[GravelBen]

MAF sounds most likely to me - especially with the greasy old K&N filter, they tend to kill MAFs. Try a squirt of MAF cleaner before replacing anything and see if that helps.

[lg2002ukuk]

ok will do thanks

[NorthDownsScooby]

lg2002ukuk said:

no but it has been modified with De-Cat, stainless steel straight through exhaust, full K&N induction kit

You had it remapped with all that stuff on matey....? There's some bit airflow changes there that can affect MAF sensor readings !

[smileykylie]

Remap on a N/A? i personally wouldnt bother if im honest...

Your car should have a self diagnostic plug under the dash, no reader needed, have a look under steering column and you should see 2 green plugs, which when connected with ignition on, but engine OFF should flash out any fault codes. Will give you a list of codes if you need it/ want to try

[lg2002ukuk]

hi i not had it remapped just yet i was planning to do that after i fix misfire and i have seen the green wires i will try that. Then let you know what code it said but also it dos have the ODB2 port aswell. Thanks for the help.

[micron750]

smileykylie said:

Remap on a N/A? i personally wouldnt bother if im honest...

Your car should have a self diagnostic plug under the dash, no reader needed, have a look under steering column and you should see 2 green plugs, which when connected with ignition on, but engine OFF should flash out any fault codes. Will give you a list of codes if you need it/ want to try

that was what i was gonna suggest although it didn't show anything with my misfire but i knew what the problem was anyway and that was coil packs

Have you tryed UKlegacy forum a lot of sound advice on there recently helped me out so its worth a look mate

[lg2002ukuk]

hi thanks i will take a look also i got a code (32) Oxygen sensor or circuit (no. 1, right side on SVX)

[cptsideways]

Check the plugs to the coilpacks, the clips fall off

[lg2002ukuk]

Hi i looked at the o2 sensor and it was that at falt so i fix that and no more misfire wooohoo thanks for all the advice.